By the end of the 20th century, an exploratory base has been built on the moon, while on Earth all the monsters of the planet have been herded together on an island called Ogasawara, where scientists study their habits.

Authorities deem Ogsawara has fallen to an alien power who released the monsters to gain control of Earth. When Captain Yamabe, of Moon Rocket SY-3, investigates, however, he finds the scientific team in apparent good health . in particular Dr. Otani, the chief scientist, who introduc~s Yamabe to a beautiful girl from the planet Kilaak.

Thus, as suspected, Ogsawara is under control of the Kilaaks, who are manipulating both the scientific team and the monsters by radio waves directed toward minute receivers imbedded in the victims' necks. Their goal of

course is domination of the planet Earth.

While the monsters continue to wreak devastation, it is discovered the action is merely to divert attention from the Kilaak purpose of constructing a subterranean base in Japan.

Their position secured, the Kilaaks deliver their ultimatum to the inhabitants of Earth.

Meanwhile, though, it is found that the transmitter used to control the monsters and the Earthmen already enslaved is located on the moon. The SY-3 is sent to destroy it.

In a horrifying encounter, the SY-3 smashes the invisible enclosure surrounding the Kilaaks and the transmitter housed with in. And to the amazement of all, the Kilaaks turn to stone!

Earth scientists, using a transmitter of their own call upon the monsters to attack the Kilaak subterranean base.

In a final attempt to win, the Kilaaks summon King Ghidorah and a flaming flying saucer from outer space to crush the Earth monsters.

The most frightening battle of monsters ever before witnessed ensues.

Nevertheless, led by Godzilla, the Earth monsters win and peace once again prevails.